Can end with bonded seal slide

ABSTRACT

A can end provided with an opening and a can end sealing portion. A slide is disposed against the can end adjacent the opening, and is provided with a first pour opening. A stationary member is disposed against the slide and is provided with a second pour opening and a stationary member sealing portion. The slide has a slide sealing portion adjacent the second pour opening and is movable to a sealing position where the first pour opening does not overlap the second pour opening. A pull tab has a connection to the slide. Engaging means engage the can end and one of the slide and the stationary member to position the stationary member sealing portion adjacent the can end sealing portion, and to press the slide against the stationary member adjacent the second pour opening. A pressure barrier material is used for sealing the can end sealing portion to the stationary member sealing portion and the slide sealing portion to the stationary member adjacent the second pour opening. The pressure barrier material is bonded to the stationary member adjacent the second pour opening with a first predetermined shear strength and to the slide sealing portion with a second predetermined shear strength less than the first predetermined shear strength. The pull tab is movable to cause the slide to move away from the sealing position to break the bond between the slide sealing portion and the pressure barrier material adjacent the second pour opening. The pull tab then is movable to cause the first pour opening to overlap the second pour opening to uncover the second pour opening.

United States Patent Douty [451 Dec. 12, 1972 [S4] CAN END WITH BONDED SEAL SLIDE [72] inventor: Donald L. Douty, Franklin Township, Westmoreland County, Pa.

[73] Assignee: United States Steel Corporation [22] Filed: Jan. 28, 1972 [21] Appl. No: 221,571

Related US. Application Data [62] Division of Ser. No. 146,945, May 26, 1971, which is a division of Ser. No. 61,384, Aug. 5, 1970, Pat. No.

Primary ExaminerStanley H. Tollberg Attorney-Robert J. Leek, Jr.

[5 7] ABSTRACT A can end provided with an opening and a can end sealing portion. A slide is disposed against the can end adjacent the opening, and is provided with a first pour opening. A stationary member is disposed against the slide and is provided with a second pour opening and a stationary member sealing portion. The slide has a slide sealing portion adjacent the second pour opening and is movable to a sealing position where the first pour opening does not overlap the second pour opening. A pull tab has a connection to the slide. Engaging means engage the can end and one of the slide and the stationary member to position the stationary member sealing portion adjacent the can end sealing portion, and to press the slide against the stationary member adjacent the second pour opening. A pressure barrier material is used for sealing the can end sealing portion to the stationary member sealing portion and the slide sealing portion to the stationary member adjacent the second pour opening. The pressure barrier material is bonded to the stationary member adjacent the second pour opening with a first predetermined shear strength and to the slide sealing portion with a second predetermined shear strength less than the first predetermined shear strength. The pull tab is movable to cause the slide to move away from the sealing position to break the bond between the slide sealing portion and the pressure barrier material adjacent the second pour opening. The pull tab then is movable to cause the first pour opening to overlap the second pour opening to uncover the second pour opening.

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1. In combination: a. a can end provided with an opening and a can end sealing portion; b. a slide disposed against said can end adjacent said opening, and provided with a first pour opening, c. a stationary member disposed against said slide and provided with a second pour opening and a stationary member sealing portion, d. said slide having a slide sealing portion adjacent said second pour opening and being movable to a sealing position where said first pour opening does not overlap said second pour opening, e. a pull tab having a connection to said slide, f. engaging means engaging said can end and one of said slide and said stationary member to position said stationary member sealing portion adjacent said can end sealing portion, and to press said slide against said stationary member adjacent said second pour opening, g. a pressure barrier material for sealing said can end sealing portion to said stationary member sealing portion and said slide sealing portion to said stationary member adjacent said second pour opening,
 1. said pressure barrier material being bonded to said stationary membEr adjacent said second pour opening with a first predetermined shear strength and to said slide sealing portion with a second predetermined shear strength less than said first predetermined shear strength; h. said pull tab being movable to cause said slide to move away from said sealing position to break the bond between said slide sealing portion and said pressure barrier material adjacent said second pour opening, and i. said pull tab then being movable to cause said first pour opening to overlap said second pour opening to uncover said second pour opening.
 2. The combination recited in claim 1 wherein said slide has a bulge strength measured in lbs./sq. inch equal to or greater than the bulge strength of said can end.
 3. The combination recited in claim 1 wherein said engaging means has a stationary member supporting one member of said stationary member, said slide and said can end and a movable member engaging another member of said stationary member, said slide and said can end.
 4. The combination recited in claim 1 wherein said engaging means is said pull tab engaging said can end.
 5. The combination recited in claim 1 wherein said pull tab is integral with said slide.
 6. The combination recited in claim 1 wherein said connection is integral with one of said pull tab and said slide.
 7. The combination recited in claim 1 wherein said connection is separate from either said pull tab or said slide.
 8. The combination recited in claim 1 wherein said connection is a weld.
 9. The combination recited in claim 1 wherein said connection is an adhesive.
 10. The combination recited in claim 1 wherein one of said pour openings is radial.
 11. The combination recited in claim 1 wherein one of said pour openings is chordal.
 12. The combination recited in claim 1 wherein said can end has an opening embossment around said opening.
 13. The combination recited in claim 12 wherein said embossment is upward.
 14. The combination recited in claim 12 wherein said embossment is downward for vacuum sealing.
 15. The combination recited in claim 1 wherein said slide has a locking tab for engaging said can end.
 16. The combination recited in claim 1 wherein said pour opening has substantially straight edges.
 17. The combination recited in claim 1 wherein said pour opening has arcuate sides.
 18. The combination recited in claim 1 wherein said pull tab is of the corrugated type.
 19. The combination recited in claim 1 wherein said pull tab is of the ring type.
 20. The combination recited in claim 1 wherein said pull tab is of the serrated type.
 21. The combination recited in claim 1 wherein said pull tab is of the projecting type.
 22. The combination recited in claim 1 wherein said pull tab is of the waffle type.
 23. The combination recited in claim 1 wherein said pull tab has a plurality of protuberances.
 24. The combination recited in claim 1 wherein said pull tab has a plurality of cavities.
 25. The combination recited in claim 1 wherein said slide is provided with a first vent aperture and said stationary member is adapted to cover said first vent aperture, said stationary member is provided with a second vent aperture, said pressure barrier material being adapted to seal said stationary member adjacent second vent aperture to said slide with said second predetermined shear strength, said slide being operable during said slide movement away from said sealing position to break the bond between said stationary member adjacent said second vent aperture and said slide then being operable to move said first vent opening into lapping engagement with said second vent aperture.
 26. The combination recited in claim 1 and having stop means on either said slide or said can end for limiting movement of said slide.
 27. The combination recited in claim 26 wherein one of said vent apertures is radial.
 28. The combination recited in claim 26 wherein one of said vent apertures is chordal.
 29. The combination reciTed in claim 26 wherein said vent apertures has substantially straight sides.
 30. The combination recited in claim 26 wherein said vent aperture has arcuate sides.
 31. The combination recited in claim 1 wherein said pull tab is of the expansion type.
 32. The combination recited in claim 1 wherein said engaging means is magnetic.
 33. The combination recited in claim 1 wherein said slide is of the rotary type.
 34. The combination recited in claim 1 wherein said slide is of the linear type. 